Title :
Design of a Lightweight Magnetic Radar Absorber Embedded With Resistive FSS
Author :
Sun, Liangkui ; Cheng, Haifeng ; Zhou, Yongjiang ; Wang, Jun
Author_Institution :
Coll. of Aerosp. & Mater. Eng, Nat. Univ. of Defence Technol., Changsha, China
fDate :
7/4/1905 12:00:00 AM
Abstract :
In this letter, the design of a lightweight magnetic radar absorber (RA) having broadband bandwidth in frequency range of 1-18 GHz is demonstrated. A 5-mm-thick magnetic RA with weak wave-absorbing performance is obtained on the basis of polyurethane foam filled with flake ferrous microwave absorbent. The use of frequency selective surfaces (FSSs) results in a significant increase of the absorbing intensity and operating bandwidth of the RA. By selecting the unit dimensions and modulating the location and square resistance of FSS, a maximal operating bandwidth with the reflectivity below -10 dB can be obtained. Experimental results are presented and compared to numerical simulations, and they demonstrated that the RA embedded with lossy FSS has a super broad bandwidth of 3.19-18 GHz with the reflectivity below - 10 dB for the double-layer case. The density of the absorber is only 0.62 g/cm3 , which is far more less than that of the conventional magnetic coating radar absorbing materials (RAMs).
Keywords :
electromagnetic wave absorption; frequency selective surfaces; radar absorbing materials; broadband bandwidth; double-layer case; frequency 1 GHz to 18 GHz; frequency range; lightweight magnetic radar absorber; maximal operating bandwidth; polyurethane foam; resistive FSS; square resistance; super broad bandwidth; unit dimensions; weak wave-absorbing performance; Bandwidth; Frequency selective surfaces; Magnetic resonance; Magnetic resonance imaging; Microwave theory and techniques; Reflectivity; Substrates; Frequency selective surface (FSS); magnetic resonance; microwave absorber;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2012.2203292
